public class Fibonacci
{
	public static void main(String args[])
	{
		System.out.println(f(5));
	}
	
	public static int f(int n)
	{
		if(n == 1 || n == 2)
		{
			return 1;
		}
		else
		{
			return f(n - 1) + f(n - 2);
		}
	}
} 